A 1949 Public Service Announcement aired on the DuMont Television Network, reminding the young viewers of "Captain Video" that "freedom is everybody's job". This features the same background as the 1950 PSA I uploaded.
DuMont was a cheap network, but in fact, they did a lot of good things, like airing the complete McCathy hearings (sadly no footage remains from their coverage). One must give them credit for good intentions.